Revert "Add io cycle detection with clircle"

This reverts commit aa2ae19dfd.

src/controller.rs

@@ -13,7 +13,6 @@ use crate::output::OutputType;
 #[cfg(feature = "paging")]
 use crate::paging::PagingMode;
 use crate::printer::{InteractivePrinter, Printer, SimplePrinter};
-use std::convert::TryFrom;
 
 pub struct Controller<'a> {
     config: &'a Config<'a>,
@@ -67,14 +66,6 @@ impl<'b> Controller<'b> {
         }
 
         let attached_to_pager = output_type.is_pager();
-        let rw_cycle_detected = !attached_to_pager && {
-            let identifiers: Vec<_> = inputs
-                .iter()
-                .flat_map(clircle::Identifier::try_from)
-                .collect();
-            clircle::stdout_among_inputs(&identifiers)
-        };
-
         let writer = output_type.handle()?;
         let mut no_errors: bool = true;
 
@@ -87,11 +78,6 @@ impl<'b> Controller<'b> {
             }
         };
 
-        if rw_cycle_detected {
-            print_error(&"The output file is also an input!".into(), writer);
-            return Ok(false);
-        }
-
         for (index, input) in inputs.into_iter().enumerate() {
             match input.open(io::stdin().lock()) {
                 Err(error) => {

src/input.rs

@@ -1,8 +1,6 @@
-use std::convert::TryFrom;
 use std::ffi::{OsStr, OsString};
 use std::fs::File;
 use std::io::{self, BufRead, BufReader, Read};
-use std::path::Path;
 
 use content_inspector::{self, ContentType};
 
@@ -193,18 +191,6 @@ impl<'a> Input<'a> {
     }
 }
 
-impl TryFrom<&'_ Input<'_>> for clircle::Identifier {
-    type Error = ();
-
-    fn try_from(input: &Input) -> std::result::Result<clircle::Identifier, ()> {
-        match input.kind {
-            InputKind::OrdinaryFile(ref path) => Self::try_from(Path::new(path)).map_err(|_| ()),
-            InputKind::StdIn => Self::try_from(clircle::Stdio::Stdin).map_err(|_| ()),
-            InputKind::CustomReader(_) => Err(()),
-        }
-    }
-}
-
 pub(crate) struct InputReader<'a> {
     inner: Box<dyn BufRead + 'a>,
     pub(crate) first_line: Vec<u8>,